ES2432857T3 - Corrugated roller for the manufacture of corrugated cardboard - Google Patents

Abstract

Corrugating roller for the manufacture of corrugated cardboard, with a) a rotation axis (2), b) a corrugation (5) to corrugate the corrugated cardboard, presenting the corrugation (5) c) corrugation ridges (16), d) undulating valleys (17) qu ee) are arranged alternately with respect to the undulating ridges (16), and f) undulating flanks (18) that g) extend between the undulating ridges (16) and the valleys of ripple (17) and join them together, and h) an air evacuation device having i) at least one air accumulation slot (19) that j) is open in the radial direction outward, k) runs at least by sections around the axis of rotation (2), l) intersects at least some of the undulating ridges (16), and m) is delimited by first (20) and second (21) side walls that are located opposite each other , n) at least one air connection channel (23), i) at least one air intake channel (25) that p) is connected by fluid with the at least one air connection channel (23), and q) can be subjected to a negative pressure, characterized in that r) the at least one air connection channel (23 ) part of at least one of the side walls (20, 21) of the at least one air accumulation slot (19).

Description

Corrugated roller for the manufacture of corrugated cardboard

The invention relates to a corrugating roller for the manufacture of corrugated cardboard. In addition, the invention relates to a corrugated cardboard machine for the manufacture of corrugated paper with such a corrugating roller.

EP 0 009 907 A1 discloses an undulating roller with air accumulation grooves running in the circumferential direction. From the groove base of the air accumulation grooves, air connection drills flow into an axially drawn air intake channel.

Additional rollers are known from GB 2 069 555 A. These have air accumulation grooves that run in the form of a ring from whose groove base air connection holes are split. The air connection holes lead to air intake channels that run axially.

15 From EP 0 657 275 B1 generic rolling rollers are known. These undulating rollers have proven useful. They have surrounding air accumulation grooves from whose groove base air connection holes start. The air connection holes lead to air intake channels that can be subjected to a negative pressure.

The invention is based on the objective of providing a corrugating roller that has a particularly high service life. In addition, an undulating roller must be created that can be manufactured especially easily and economically. A corresponding corrugated cardboard machine must also be provided.

This objective is achieved according to the invention by the features mentioned in independent claims 1 and 15. The essence of the invention is that the at least one air connection channel laterally part of the at least one air accumulation slot, in particular of its flank. This effectively prevents breakage of rollers in the transition zone between the groove base of the at least one air accumulation groove and the at least one air connection channel that has occurred in the undulating rollers known to the state of the art In particular, by means of the air evacuation device, air which is included in the area of the undulating valleys of the corrugating roller in reciprocal effect can be evacuated with a complementary corrugating roller between the corrugating roller and the band to be corrugated. The evacuation of the air has the consequence that the manufacture of corrugated cardboard is not altered by the inclusion of air. In addition, the band to be undulated can be fixed securely on the corrugating roller by means of the evacuation device

35 air

Exactly an air accumulation slot can be provided. However, several air accumulation slots that have regular and / or irregular distances from each other may also be present. Preferably the at least one air accumulation slot is located in a plane that runs perpendicular to the axis of rotation. The plane is defined by the path of the air accumulation slot.

The at least one air connection channel is favorably configured as a bore. It is advantageous when the at least one air connection channel runs straight and / or is configured in a closed manner with respect to its cross section. Advantageously, the at least one air connection channel has a section

45 circular cross.

Preferably the at least one air intake channel extends parallel to the axis of rotation. The at least one air intake channel can be requested with negative pressure by means of a source or unit of negative pressure. The negative pressure unit can be a negative pressure pump. Advantageously, several air intake channels are provided.

The undulation can extend parallel to the axis of rotation. However, it can also be placed in at least one plane that extends at least obliquely to the axis of rotation. The undulation can have a special geometric path, such as a wave-like path.

Additional advantageous configurations are indicated in the dependent claims.

The corrugating roller according to claim 2 can be manufactured very simply. In addition, a very large amount of air can be evacuated.

Also the configuration according to claim 3 allows a very large evacuation of air.

By means of the configuration according to claim 4 the included air can be sucked very easily. The configuration according to claim 4 is especially favorable with respect to the flows. The connection channel of

The air can also run obliquely to the axis of rotation and directly towards it. However, it can also be spread warped with respect to the axis of rotation.

The corrugating roller according to claim 6 can be manufactured very simply. Thus, the air accumulation slot has a constant opening width. However, alternatively it can also be narrowed at least by sections from radially on the outside to radially on the inside.

5 The air accumulation groove can follow the ripple profile in terms of its depth, so that the air accumulation groove has a constant depth. However, the groove base of the air accumulation groove can also have a continuous distance from the axis of rotation, so that the air accumulation groove has practically different depths due to undulation.

By means of the configuration according to claim 7 a very large amount of air can be evacuated again. Thus, the air accumulation groove is closed by the circumference of the corrugating roller.

According to claim 8, the air accumulation slot extends only through a limited partial circumference of the corrugating roller. Thus, the air accumulation slot is not closed by the circumference of the roller

15 corrugator Thus, the air accumulation slot is formed by at least one individual section.

The configuration according to claim 9 provides an especially advantageous air evacuation. Thus, the air accumulation groove runs at least obliquely with respect to the axis of rotation.

The air accumulation grooves according to claim 10 can intersect each other and / or terminate apart from each other. In this regard several air accumulation slots can run parallel to each other.

The configuration according to claim 11 is characterized by its very high permanent resistance. The base zone is unchanged. Therefore it is free of an air connection channel or air connection channels. In

In particular, an inlet opening of an air connection channel is not provided therein.

According to claim 12 the corrugating roller is configured as a roller wrap. It is advantageous when the at least one air accumulation groove, the at least one air connection channel and the at least one air intake channel are completely arranged in the roller wrap.

The assembly unit according to claim 15 preferably comprises a gluing unit for gluing together the corrugating band and the covering band.

A preferred embodiment of the invention will now be described by way of example with reference to the attached drawing. In this regard they show:

Figure 1, a schematic view of a corrugated cardboard machine according to the invention,

Figure 2, a section through a part of an undulating roller according to the invention, and

Figure 3, detail A depicted in Figure 2.

The corrugated cardboard machine schematically represented in Figure 1 is used for the manufacture of corrugated cardboard on one side. It has a central corrugating roller 1 that is actuated by turning around

45 its axis of rotation 2 and is housed through housing devices (not shown) in a correspondingly rotatable manner. An undulation band 3 is guided at a bonding angle of approximately 180 ° around the corrugating roller 1. The undulation band 3 is derived from a corrugated strip feeding device (not shown) and is guided through a device for supply of corrugating bands (not shown) to the corrugating roller 1. The corrugating belt feeding device is preferably configured as a feeding roller.

Below the corrugating roller 1, a complementary corrugating roller 4 is arranged, which is actuated by turning counterclockwise to the corrugating roller 1 or is practically dragged during operation by the corrugating roller 1. The complementary corrugating roller 4 is correspondingly rotatable.

55 by means of accommodation devices (not shown). The corrugating roller 1 and the complementary corrugating roller 4 have in each case a corrugation 5 or 6. The corrugations 5, 6 engage each other, whereby the corrugating band 3 which is smooth in front of the entrance in the groove of Roller 7 formed between the corrugating roller 1 and the complementary corrugating roller 4 is pressurized into the corrugation 5 of the corrugating roller 1 and therefore corrugating.

Laterally next to the corrugating roller 1 there is arranged a gluing unit 8 comprising an applicator roller 9 and a so-called extractor roller 10 as well as a glue tub open upwards 11. The applicator roller 9 and the extractor roller 10 are housed in a manner swivel The extractor roller 10 and the applicator roller 9 on the one hand as well as the applicator roller 9 and the undulating roller 1 on the other hand are in mutual contact, whereby a defined glue layer is applied conventionally on the crest areas protruding from the corrugating strip 3. The applicator roller 9 enters the glue tub 11 in the tail, removing the roller

Extractor 10 excess tail. Other gluing units known in the prior art can be used in this case alternatively.

A smooth pressure roller 12 is rotatably housed above the corrugating roller 1. Between the roller

5 pressure 12 and the corrugating roller 1 is formed a roller groove 13. A cover strip 14 is guided through the roller groove 13. The cover band 14 is derived from a cover strip feeding device (not shown). ) and is guided through a cover strip supply device (not shown) into the roller groove 13. The cover strip feed device is preferably configured as a feed roller. In the roll groove 13, the corrugating band 3 and the covering band 14 meet each other, so that a corrugated cardboard is produced on one side. The corrugating roller 1 also has a heating (not shown) and an air evacuation device which is also not shown in Figure 1. The air evacuation device fixes the undulating band 3 on the corrugating roller 1 on one side. on the other hand, through the air evacuation device, air that is included between the corrugating band 3 and the corrugating roller 1 can be evacuated and thus can alter the manufacturing

15 of corrugated cardboard. The corrugating roller 1 has a hollow cylindrical roller casing 15 that can be actuated by turning around the axis of rotation 2. The roller casing 15 has on the outer side the undulation 5 which extends parallel to the axis of rotation 2. The undulation 5 has radially outer rippling ridges 16 and radially inner undulating valleys 17 which are arranged alternately with each other and running parallel to the axis of rotation 2. Furthermore, the undulation 5 comprises undulating flanks 18 which extend between the undulating ridges 16 and the undulating valleys 17 and join them together. The undulation ridges 16 are formed in each case by partial arcs.

In the roller casing 15, several air accumulation slots 19 are also provided, which in each case

25 run in a plane perpendicular to the axis of rotation 2. The air accumulation slots 19 are configured as a ring. They are open in the radial direction outwards and run according to the embodiment described completely around the axis of rotation 2. The air accumulation slots 19 may have a uniform distance from each other in the direction towards the axis of rotation 2. They have a depth somewhat greater than ripple

5.

Each air accumulation slot 19 is delimited laterally through a first side wall 20 and a second side wall 21 in the direction towards the axis of rotation 2. The side walls 20, 21 of an air accumulation slot 19 are located opposite each other. Preferably they run parallel to each other and have a distance from 0.5 mm to 6 mm, more preferably from 1 mm

35 to 3 mm. The first side wall 20 and the second side wall 21 of an air accumulation groove 19 are connected to each other through a radially inner groove base 22 which is preferably curved in an arc with respect to its section. However, the slot base 22 may also have a different path. For example, it can also be extended at least in straight sections.

From each air accumulation slot 19 laterally part at least one air connection channel 23 which is preferably configured as a straight bore with a circular cross-section in the roller wrap

15. The at least one air connection channel 23 has a favorable diameter between 0.5 mm and 6 mm, more preferably between 1 mm and 3 mm. It is advantageous when several air connection channels 23 start from an air accumulation slot 19 which then preferably have an identical angular distance from each other.

45 The air connection channels 23 start in each case from the side wall 20 or 21 of the air accumulation slots 19. Corresponding inlet openings are provided for this in the side walls 20 or 21. According to the described embodiment the air connection channels 23 all start from the second side wall 21, that is, they all start from the same side of the air accumulation slot 19. The air connection channels 23 start from a radially outer head area 24 of the corresponding air accumulation slot 19. Thus they are connected to the corresponding air accumulation slot 19 with a distance from the respective slot base 22. Between an air accumulation slot 19 and a connection channel of air 23 in each case there exists an angle b between 2 ° and 45 °, preferably between 5 ° and 20 °. The air connection channels 23 all extend from the respective air accumulation slot 19 in the direction towards the axis of rotation 2 and

55 also along it. They run radially and obliquely with respect to the axis of rotation 2. The air connection channels 23 can alternatively start from different sides 20, 21 of the air accumulation slots 19. An alternating arrangement is possible. Alternatively, the air connection channels 23 that start from each side from side 20 or 21 can also be grouped together.

The air connection channels 23 all flow into air intake channels 25. For this purpose, the corresponding mouth openings 23 are provided in the air connection channels. The air intake channels 25 run parallel to and around the axis of rotation 2 and around it and are arranged in the roller casing 15. The air intake channels 25 are preferably circularly configured with respect to their section cross. The air intake channels 25 are connected

65 by fluid with a negative pressure unit or vacuum unit. The air accumulation slots 19 end with a distance from the air connection channels.

The air accumulation slots 19, the air connection channels 23 and the air intake channels 25 together form the air evacuation device.

The air evacuation device during operation is described below. Through the unit of

5 negative pressure air intake channels 25 with a negative pressure are requested. Through the negative pressure prevailing in the air intake channels 25, air is drawn through the air connection channels 23 from the air accumulation slots 19. This is due to the fact that the air accumulation slots 19 they are fluidly connected to the air intake channels 25 through the air connection channels 23 and thus can also be subjected to a negative pressure. The air accumulation slots 19 arrive

10 to the undulation band 3.

The complementary corrugating roller 4 can also comprise the described air evacuation device.

Claims (13)

1. Corrugated roller for the manufacture of corrugated cardboard, with 5 a) a rotation axis (2), b) a corrugation (5) to undulate the corrugated cardboard, presenting the corrugation (5) c) undulating ridges (16), d) undulating valleys (17) that 10 e) are arranged alternately with respect to undulating ridges (16), and f) undulating flanks (18) that 15 g) extend between the undulating ridges (16) and the undulating valleys (17) and join them together, and h) an air evacuation device that features 20 i) at least one air accumulation slot (19) that j) is open in the radial direction outward, k) runs at least in sections around the axis of rotation (2), l) intersects at least some of the ridge ridges (16), and 25 m) is delimited by first (20) and second (21) side walls that are located opposite each other, n) at least one air connection channel (23), and o) at least one air intake channel (25) that 30 p) is connected by fluid with the at least one air connection channel (23), and q) can be subjected to a negative pressure,  characterized by that 35 r) the at least one air connection channel (23) part of at least one of the side walls (20, 21) of the at least one air accumulation slot (19). 2. An undulating roller according to claim 1, characterized in that the air accumulation slot (19) it has a radially outer head area (24), the air connection channel (23) starting from the head area (24) of the air accumulation slot (19). 3. An undulating roller according to claim 1 or 2, characterized in that the air connection channel (23) is also part of an undulating valley (17). 4. An undulating roller according to one of the preceding claims, characterized in that the air connection channel (23) runs obliquely with respect to the air accumulation slot (19). 5. An undulating roller according to claim 4, characterized in that between the air connection channel (23) and the air accumulation slot (19) there is an angle b, being: 2 ° <b <45 °, preferably 5 ° <b <20 °. fifty 6. An undulating roller according to one of the preceding claims, characterized in that the side walls (20, 21) run parallel to each other. 7. An undulating roller according to one of the preceding claims, characterized in that the air accumulation groove 55 (19) runs completely around the axis of rotation (2). 8. An undulating roller according to one of claims 1 to 6, characterized in that the air accumulation slot (19) only runs through a part of the perimeter of the undulating roller around the axis of rotation (2). A corrugating roller according to one of the preceding claims, characterized in that the air accumulation slot (19) is located in at least one plane that runs obliquely with respect to the axis of rotation (2). 10. Roller according to one of the preceding claims, characterized in that several are provided air accumulation slots (19), at least two of the air accumulation slots (19) being located in 65 intersecting planes. 11. An undulating roller according to one of the preceding claims, characterized in that the air accumulation slot (19) has a radially internal base area (22) that is configured in a closed manner. 12. Corrugating roller according to one of the preceding claims, characterized by a roller wrapping in a ring mode (15) in which the air evacuation device is arranged. 13. The corrugating roller according to one of the preceding claims, characterized by several air accumulation grooves (19), starting from each second side wall (21) the at least one air connection channel (23).

14.

 An undulating roller according to one of the preceding claims, characterized in that at least one air connection channel (23) is provided in the area of each undulating valley (17).

fifteen.

 Corrugated cardboard machine for the manufacture of corrugated cardboard comprising

15 a) at least one undulating band supply device for supplying at least one undulating band (3), b) at least one undulating device for undulating the at least one undulating band (3), the at least comprising a waving device C) at least one rotating roller-driven corrugator (1) according to one of the preceding claims, and d) at least one complementary corrugating roller (4) assigned to at least one corrugating roller (1), E) at least one cover strip supply device for supplying at least one cover band (14), and f) at least one assembly unit for joining at least one undulating band (3) and the minus a cover band (14).